Method of making connections between machine parts



w" A. ABEGG 1 865,868

CHINE PARTS I July 5, 1932.

Original Filed March 12, 1928 ing of the parts, but are only separableupon Patented July 5, 1932 UNITED STATES PATENT OFFICE WALTER A. ABEGG,0F LOS ANGELES, CALIFORNIA, ASSIGNOR, BY DIRECT AND-MESNE ASSIGNMENTS,TO WIEMAN KAIHMERER WRIGHT 00., INCORPORATED, OF HOLLY- A DALE,CALIFORNIA, A CORPORATION OF CALIFORNIA lrIETHOD OF MAKING CONNECTIONSBETWEEN MACHINE PARTS Original application filed March 12, 1928, SerialNo. 261,057. Divided and this application filed December 14, 1929.Serial No. 414,046.

This invention relates to a method of making a. connection betweenmachine parts, or the like, and it is a general object of the inventionto provide a simple, practical and economical method of making aconnection of the type set forth and claimed in my copending applicationentitled Connection for machine parts, Serial N 0. 261,057, filed MarchThis application is filed as a division of my co-pending applicationabove identified.

In many machines and manufactures it is desirable or necessary toconnect adjoining parts securely andso that there is no danger of theconnection working loose or of its being broken either by use ordeliberately. Connections of the type referred to occur or are desirablein various safe and look constructions and throughout many othermachines and manufactures. No attempt will be made to list the numeroussituations in which the invention is usefulnor to set forth the manyobvious variations of the invention. I will confine the disclosure toone simple and typical application of the invention wherein it is usedin making a' connection between adjoining parts of a well boring tool,viz: a cutter, and it mounting bushing.

By the present invention a connection is made between two parts wherebythe parts are connected so that they cannot possibly become separatedthrough vibration or workfailure or wearing out of the parts.

An ob ect of thls lnvention is to provide a method of making aconnection of the character mentioned quicklyand economically.

It is a general object of this invention to provide an improvedcommercially practical method of handling the parts entering into aconnection of the character mentioned.

' stood from the following detailed description The various objects andfeatures of my invention will be best and more fully underof a typicalmanner of. the carrying out of the invention, throughout whichdescription I refer to the accompanying drawing, in which:

Fig. 1 is a sectional view of a construction or assembly made in.accordance with the present invention. Fig. 2 is a transverse sectionalview of the parts shown in Fig. 1,'being a View taken as indicated byline 22 on Fig. 1.. Fig. 3 is an enlarged exterior elevation of one ofthe connected parts shown Fig. 4 is an enlarged sectional view ingparts, which connection may be such as to allow the parts to workrelative to each other. For the purpose of illustration and withoutrestricting the use of application of the invention, I will describe itas applied to making a connection between parts of a well.

drill, that is, the cutter and mounting bush ing of a drill, and I willdescribe it in a form of the invention which forms a connection allowingthe connected parts to rotate relative to each other.

It is believed that a clear understanding" of the present invention willbe aided by a description of the parts to be connected and the detailsof the finished connection.

The two parts A and B to be connected,

are adjoining or are fit together, preferably one into the other. Eachof the parts is solid or integral, that is, it is without joints ordetachable parts at or in connection with the joint or connection that Iam about to de-. scribed.- In the drawing I have shown the part A as theouter part and in the form of a roller cuttersuitablefor a rock drill,orthe like. The other or inner part B is shown in the form of abushingadapted to form a mounting for the cutter A. The cutter A issubstantially conical in shape and has an opening 10 formed in it fromits base end to receive the bushing or inner part B. The

bushing fits into the opening 10 with the desired clearance and isprovided with a screw-'' threaded socket 30-to receive a stud or othermounting member. It is to'be understood that the bushing and itsreceiving opening are round in cross section to permit the de- 12. The;passage 1 is accomplished by ,so that the end'entering the passage 14 issired rotation of the cutter with reference to the bushing.

The connection includes a groove or seat 11 in the outer face orrsurfaceof the bushing B, a corresponding recess 12 in the wall of the opening10 to register with the seat 11, and a connecting bar or member 13-arranged in the seat 11: andproj-ectinginto the recess 12. Where theparts are to rotate as they are in this case, the seat 11 is annular orcontinuous around the bushingB,rwhile the recess 12 is likewise annularor continuous in the wall of the opening 10. The connecting member 13 istightly seated in the seat 11 and preferably extends substantially theentire distance around .thebushing B as shown in Fig. 2 of the dr awing.

The method provided by my invention for the insertionof the lockingmember 13 into operating position provides the insertion of the member13 between the parts A and B through a pipe 14in one of the parts andthe wrapping of the member around the bushing B by relative rotationbetween the parts A and B. a In the construction shown the passage 14 isin the outer part or cutter A, and is tangentially disposed withreference to theopening formed by the seat 11 and recess 14 is ofsufiicient size to member 13. The desired feed of the 13 into placearoundthe bushing B arranging the member 13 pass the member held by thebushing B or is attached to the bushing-B so that relative rotationbetween thebushing and cutter causes the member 13 to be drawn into,place through the passage 14 and wrapped onto the bushing B. In theparticular construction illustrated, the member 13 is in the form of astraight bar as it is passed through the passage 14 and is notched atitslforwardor entering end to receive a'projection orpin 18 projectingfrom I the bushing" into theseat 11. 'The'manner in which therpinprojection 18 .engages the notch 31 in the member 13at the start of theoperation .will be readily understood from inspection of Fig. 5 of thedrawing. Fig. 6

of thedrawing'shows the operation partially completed at which timeapart of the member 13 is wrapped around the bushing B, while a part isstillstraight. and in the passage' 14. In Fig. 2 of the drawing themember is shown wrapped completely around the bushing B, it beingobvious that the member 13 is proportioned so that it extendssubstantially the entire distance around the bushmg. I

To thus apply the member 13 it is obvious that it must be more or lessmalleable or. pliable otherwise'it could not be worked from the straightconditionin which it passes through the passage 14 to the curved orannular condition in. which it surrounds the bushing'B.

until it is malleable,

t fitting around the other and In carrying out the invention I prefer touse a member 13 of metal or material sufficiently malleable to allow itto be thus wrapped around the bushing'B. In accordance with thepreferred form of the invention, I use iron, steel or other metal which,under normal conditions, is not sufficiently malleable to permit of thewrapping operation necessary in applying the member to the bushing. Thismetal member 13 is heated to a temperature which permits of it beingworked or readily bent and, while in the heated condition, it isinserted through the passage and wrapped around the bushing by relativerotation between the bushing and cutter. As the member 13 thus appliedcools, it shrinks onto the bushing and therefore becomes set or fixed onthe bushing. The shrinkage of the member 13 further causes it to freeitself from the recess in thecutter, allowing the cutter to be free torotate on the bushing. It will be apparent that the member 13 can inthis manner be applied to the parts to securely connect them togetherwithout preheating the parts or otherwise handling them in a manner thatmight warp them or destroy their temper. When the member 13 has beenwrapped onto the bushing as shown in Fig. 2 the passage 14 may be closedby a plug 30, or the like.

From the foregoing description it will be obvious that my inventionmakes a connection which is secure and dependable and which is totallywithout screw-threaded or other like joints subject to becoming loose.It will also be apparent that the connection is permanent, and in thecase of lock or safe constructions is such that it cannot be opened byordinary methods or tools. A removal of the plug 30, through which theconnecting member is arranged in place, will not permit of the member 13being withdrawn-as the member 13 cannot be engaged to withdraw it and,further, the member 13, when shrunk on the bushing, can only be removedby cutting or destroying the parts.

Having described only a typical preferred manner of carrying out myinvention, I do not wish to limit myself to the specific details setforth, but wish to reserve to myself any changes or variations that mayappear to those skilled in the art or fall within the scope of thefollowing claims.

Having described my invention, I claim:

1. The method of connecting two parts one fitting around the other andhaving a space betweenthem including heating a body of metal that isrigid at normal temperatures introducing the heated body into said spaceto conform to the shape of the space, and then allowing the body ofmetal tocool and contract to tightly grip the said other part.

2. The method of connectin' two'parts one having a space between themcurved about their centers including heating a bar of metal that isrigid at normal temperatures to render it malleable, introducing theheated bar into the space through an opening in the outer part,connecting the entering end of the heated bar with the inner part,rotating one part relative to the other to cause the bar to be drawninto the space, and then allowing the bar to cool and shrink onto theinner part to be immovably connected therewith.

3. The method of connecting two parts one fitting around the other andhaving a space between them curved about their centers including,heating an elongated body of metal that is rigid at normal temperaturesto render it malleable, bending the said body while hot around the innerpart to occupy the space, and then allowing the said body to shrink ontothe inner part as it cools to permanently grip the inner part. v

4. The method of connecting two parts one fitting around the other andhaving a space between them curved about their centers including,heating a normally rigid rod to render it malleable connecting one endof the heated rod to one of the parts and moving the parts so that therod is drawn into the space between the parts, and then allowing the rodto cool to shrink onto and permanently grip the said other part.

5. The method of connecting two parts one fitting around the other andhaving a space between them curved about their centers including,heating a normally rigid rod to render it malleable connecting one endof the heated rod to the inner part and moving the parts so that the rodis drawn into the space between the parts, and then allowing the rod tocool to permanently shrink onto the inner part.

6. The method of connecting two parts one fitting around the other andhaving a space between them including heating a bar of metal having arelatively high melting point and that is rigid at normal temperaturesto render it malleable, introducing the heated bar into the spacethrough an opening in one part, bending the heated bar around the innerpart, and then allowing the bar to shrink onto the inner part.

In witness that I claim the foregoing I have hereunto subscribed my namethis 6th day of December, 1929.

WALTER A. ABEGG.

